ENGLISH
REFERENCE

flexible

adj. · n.
US //ˈfɫɛksəbəɫ// UK //flˈɛksɪbəl// flex·i·ble
  1. 1 physically bendable (adj.)
    B1 Intermediate

    able to bend easily without breaking.

    capable of being flexed, turned, or twisted without structural failure.

    Example

    The gymnast used a flexible mat to protect her joints during the routine.

    Example

    Modern aerospace engineering relies on flexible composite materials that can withstand significant aerodynamic pressure without fracturing.
    • pliable
    • bendy
    • supple
  2. 2 adaptable to change (adj.)
    B2 Upper Intermediate Academic

    able to change or be changed easily to suit new situations.

    capable of being adapted or modified to meet varying conditions or requirements.

    Example

    My boss is very flexible about which hours I work as long as the job gets done.

    Example

    The software architecture was designed to be flexible, allowing developers to integrate third-party modules without rewriting the core codebase.

    Teacher's tip

    This is the most common sense in professional and academic contexts, often describing schedules, plans, or mindsets.
Show 2 more sensesShow fewer
  1. 3 easily influenced (adj.)
    C1 Advanced Formal

    willing to change your mind or do what others want.

    prone to yielding to the influence or will of others; not obstinate.

    Example

    He has a flexible personality and usually agrees with whatever the group decides.

    Example

    The negotiator was criticized for being too flexible on key policy points, leading to a compromise that satisfied neither party.

    Teacher's tip

    In this sense, the word can sometimes have a slightly negative connotation, suggesting a lack of firm principles.
  2. 4 a flexible object (n.)
    C2 Proficiency Technical Technical

    an object or material that is able to bend.

    a substance or structural element characterized by its ability to flex.

    Example

    The plumber replaced the rigid pipe with a plastic flexible to allow for movement.

    Example

    The specifications required the installation of high-grade flexibles to accommodate the thermal expansion of the industrial heating system.

    Usage

    Used primarily in engineering or manufacturing contexts.

Origin

From Middle French flexible, from Latin flexibilis, from flectō (“to bend, curve”). Morphologically flex + -ible.

© 2026 English Reference